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Paul, you're not doing anything wrong.
The 18-55 is a reasonably wide-angle lens and it doesn't have a particularly large maximum aperture.
The picture in the manual is unfortunately a bit misleading and as Andrew says, is intended to illustrate the concept of shallow depth of field rather than what can be done with a particular lens.
Wide-angle lenses intrinsically have quite a large depth of field.
I'm just wondering if the 18-55 kit lens is the only lens you have or whether you bought the twin lens package. If you have a telephoto lens try the shot using it. You'll find you need to move back a bit but you should easily be able to achieve that very shallow depth of field with the aperture wide open.
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